package com.jh.paymentchannel.util.wlb;

import java.awt.Color;
import java.awt.Font;
import java.awt.Graphics;
import java.awt.image.BufferedImage;
import java.util.Random;

public class CheckCodeUtils {

	public static BufferedImage getImg(String s) {
		try {
			int width = 80;
			int height = 25;
			// 取得一个4位随机字母数字字符串

			BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
			Graphics g = image.getGraphics();
			// 设定背景色
			g.setColor(getRandColor(200, 250));
			g.fillRect(0, 0, width, height);

			// 设定字体
			Font mFont = new Font("Fixedsys", Font.PLAIN, height);
			g.setFont(mFont);

			// 画边框
			// g.setColor(Color.BLACK);
			// g.drawRect(0, 0, width - 1, height - 1);

			// 随机产生干扰线，使图象中的认证码不易被其它程序探测到
			g.setColor(getRandColor(160, 200));
			// 生成随机类
			Random random = new Random();
			for (int i = 0; i < 155; i++) {
				int x2 = random.nextInt(width);
				int y2 = random.nextInt(height);
				int x3 = random.nextInt(12);
				int y3 = random.nextInt(12);
				g.drawLine(x2, y2, x2 + x3, y2 + y3);
			}

			// 将认证码显示到图象中
			g.setColor(new Color(20 + random.nextInt(110), 20 + random.nextInt(110), 20 + random.nextInt(110)));

			g.drawString(s, 4, 20);

			// 图象生效
			g.dispose();
			// 输出图象到页面

			return image;
		} catch (Exception e) {
			e.printStackTrace();
			return null;
		}

	}

	public static Color getRandColor(int fc, int bc) { // 给定范围获得随机颜色
		Random random = new Random();
		if (fc > 255)
			fc = 255;
		if (bc > 255)
			bc = 255;
		int r = fc + random.nextInt(bc - fc);
		int g = fc + random.nextInt(bc - fc);
		int b = fc + random.nextInt(bc - fc);
		return new Color(r, g, b);
	}
}
